Using the method developed by unrEVOked and AlphaRev (they call it REVOLUTIONARY) I have rooted my Sensation 4G. Here is the XDA page on how to get S-OFF and Root the phone. It was relatively easy to do.

I try doing this, but when I enter the BETA key I keep getting the error message "invalid key aborting". I've tried numerous times and am entering using caps where there should be. Any ideas?

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I know this is an old post but figured if someone else looks or needs it. If you have trouble with entering beta key copy and paste. This method has worked for me on many EVO 3ds and 4g. Imo do what ever it takes to get this method to.work. why? Since it can be reversed and no watermark on your phone if you need to warranty.